Lakes oligotrophic

Kainz M, Lucotte M, Parrish CC. 2003. Relationships between organic matter composition and methylmercury content of offshore and carbon-rich littoral sediments in an oligotrophic lake. Can J Fish Aquat Sci 6 888-896. 

Orlandini KA, Penrose WR, Harvey BR, et al. 1990. Colloidal behavior of actinides in an oligotrophic lake. Environ Sci Technol 24(5) 706-712. 

The non point source loading rates (NPSLDG) for an Eutrophic Lake or an Oligotrophic Lake can be similarly calculated using the Reinert - (3) Approach. 

The data in Table V indicate that runoff of CGA-72662 from 12 applications would result in extremely low concentrations of CGA-72662 in ponds and lakes. The water column in all cases would contain all of the chemical, the sediment little or no CGA-72662. It follows from these data that exposure of CGA-72662 to aquatic organisms would be low. The data in Table V also shows that CGA-72662 would be persistent only in eutrophic lake environments. After the load is removed, the half-life of CGA-72662 in ponds, eutrophic lakes and oligotrophic lakes was 13, 62, and 5 days respectively. Self purification times were 9, 12, and 3 months respectively. 

Species (ppm) Pond Eutrophic Lake Oligotrophic Lake... 

Oxidation half-lives predicted by one compartment model t,/2 = 38 h in stream, eutrophic pond or lake and oligotrophic lake based on peroxy radical concentration of 10-9 M (Smith et al. 1978) aquatic fate rate k = 5 x 103 M-1 s-1 with t,/2 = 38 h (Callahan et al. 1979) ... 

Di- -octylphthalate may also undergo photolysis in surface waters as a result of its absorption of electromagnetic radiation at wavelengths less than 290 nm. The estimated photolytic half-life of the compound in surface water is 144 days (EPA 1992a). Photolysis was predicted to be the most important removal mechanism after volatilization for di- -octylphthalate losses from oligotrophic lakes (Wolfe et al. 1980). 

Rellstab CV, Maurer MZ, Biirgi HR, Spaak P (2007) Temporary collapse of the daphnia population in turbid and ultra-oligotrophic Lake Brienz. Aquat Sci 69 257-270... 

Estimates of denitrification rates range from 54 to 345 xmol/m2 per hour in streams with high rates of organic matter deposition, 12 to 56 xmol/m2 per hour in nutrient-poor oligotrophic lakes, and 42 to 171 xmol/m2 per hour in eutrophic lakes (62). Rudd et al. (64) reported an increase in the rate of denitrification from less than 0.1 to over 20 xmol/m2 per hour in an oligotrophic lake when nitric acid was added in a whole-lake experimental acidification. This result suggests that freshwater denitrification may be limited by N03" availability. In deep muds of slow-flowing streams, the process can effectively reduce N03" concentrations in... 

Existing data lend mixed support to the hypothesis that sulfate reduction is limited by availability of electron donors. Laboratory studies have shown that sulfate reduction in sediments can be stimulated by addition of carbon substrates or hydrogen (e.g., 85, 86). Increases in storage of reduced sulfur in sediments caused by or associated with addition of organic matter (108, 109) also have been interpreted as an indication that sulfate reduction is carbon-limited. Addition of nutrients to Lake 227 in the Experimental Lakes Area resulted in increased primary production and increased storage of sulfur in sediments (110, 111). Natural eutrophication has been observed to cause the same effect (23, 24, 112). Small or negligible decreases in sulfate concentrations in pore waters of ultra-oligotrophic lakes have been interpreted... 

Figure 9a), a relationship between inorganic S and Fe content may indicate that transformation of seston S to inorganic forms depends on the availability of iron (see also refs. 35-37). Alternatively, it may indicate that in oligotrophic lakes rates of putrefaction are lower than rates of Fe2+ formation (186) as eutrophication proceeds, rates of sulfide production exceed rates of Fe reduction and the relationship between inorganic S and Fe contents is lost. 

As discussed above, lipophilicity is a major determinant of the bioaccumulation potential of a chemical. However, lipophilic chemicals also have greater propensity to sorb to sediments, thus rendering them less available to bioaccumulate. For example, sorption of benzo[a]pyrene to humic acids reduced its propensity to bioaccumulate in sunfish by a factor of three. Fish from oligotrophic lakes, having low suspended solid levels, have been shown to accumulate more DDT than fish from eutrophic lakes that have high suspended solid contents. 

Cole, J. J., W. H. McDowell, and G. E. Likens. 1984. Sources and molecular weight of dissolved organic carbon in an oligotrophic lake. Oikos 42 1-9. 

Tranvik, L. J. 1988a. Availability of dissolved organic carbon for planktonic bacteria in oligotrophic lakes of differing humic content. Microbial Ecology 16 311-322. 

Francko (1986) How does the addition of Fe and DOC to a clear oligotrophic lake affect P dynamics TP-uptake, TAPA and Tfree P04" with UV exposure proposed Tproductivity (untested)... 

Dodds, W. K., J. C. Priscu, and B. K. Ellis. 1992. Seasonal uptake and regeneration of inorganic nitrogen and phosphorus in a large oligotrophic lake Size-fractionation and antibiotic treatment. Journal of Plankton Research 13 1339-1358. 

Coveney, M. F., and R. G. Wetzel. 1995. Biomass, production, and specific growth rate of bacterioplankton and coupling to phytoplankton in an oligotrophic lake. Limnology and... 

Volatilization t,/2 = 7000 h in stream, t,A = 35000 h in eutrophic pond and t,A = 28000 h in eutrophic lake and oligotrophic lake, based on transformation and transport of quinoline predicted by the one-compartment model (Smith et al. 1978). 

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